There are two opposite forces influencing the satellite.
有两股反向的力量影响着卫星。
Two opposite forces make the satellite turn round and round.
两种相反的力使卫星不停地旋转。
Everything is in a pair of opposite forces and in a state of equilibrium.
任何事物都处在一对相反作用力之下,且处于平衡状态。
So, massless bodies will always have, like a massless rope, equal and opposite forces on the two ends.
所以无质量的物体,比如这个绳子,两边所受的力永远都相等
you're looking for that equal and opposite forces acting at two ends of the rope.
你就得求出作用在绳子两端的,大小相等方向相反的力
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